Why would you assume there is a link between fasting and catching covid - and then somehow being at greater risk of more severe consequences.
Clearly there are no studies and no one with any knowledge on this matter would be on Reddit answering your question.
Deal with real issues instead of imaginations.
Put a mask on, become a shut in, disregard and stay away from everyone you know and love, let someone poke you with their long needle and don’t go to work or buy food. You will lose weight very quickly and get that beach body you want 👍
Fasting doesn’t inhibit the immune system. It gives the body more energy to fight with and allows you to metabolize things faster.
The 3 day plan would be perfect (if you are into that length of fast) because you start regenerating white blood cells after 3 days. Ultimately, the major increase with this strategy comes with the refeed.